广西英罗港不同红树林群落土壤CO2和CH4通量对气温变化的响应

采用WEST-1011便携式土壤通量测量仪对广西北海英罗港自然保护区不同红树植物群落土壤的CO2和CH4排放通量特征以及其与气温的关系进行研究。结果表明,各群落土壤CH4通量的值都较小,在-2~3μmol.m-2.s-1之间;红海榄Rhizophora stylosa群落、木榄Brugiera gymmonhiza群落一天的CO2通量变化很小,秋茄Kandelia candel群落一天的CO2通量变化比较明显,最大值出现在19：00,为5.001μmol.m-2.s-1,桐花树Aegiceras corniculatum群落一天的CO2通量变化明显,最大值出现在11：00,为8.325μmol.m-2.s-1。排放通量与气温做相关性研究发现,气温与红海榄群落、木榄群落土壤CH4通量与气温呈不显著的正相关关系,与秋茄群落呈现极其显著的负相关关系,与桐花树群落呈显著的负相关关系;气温与红海榄群落、木榄群落、秋茄群落、桐花树群落的土壤CO2通量均呈不显著的负相关关系。

Effects of air temperature on soil CO2 and CH4 fluxes of different mangrove communities in Yingluo Guangxi

We studied characterization of soil CO2 and CH4 emission flux of various species mangrove communities,and relationship between soil CO2 and CH4 emission flux of various species mangrove communities in natural conservation area of Yingluo Bay of Guangxi and air temperature by WEST-1011 portable soil measuring instrument.The results showed that soil CH4 fluxes of all communities are from-2 to 3 μmol.m-2.s-1.CO2 fluxes of Rhizophora stylosa and Brugiera gymmonhiza make little changes every day,whereas CO2 fluxes of Kandelia candel and Aegiceras corniculatum have obvious changes,the maxnism value are 5.001 μmol.m-2.s-1 in 19：00 and 8.325 μmol.m-2.s-1 in 11：00,respectively.The studies on correlation between emission flux and air temper-ture demonstrated air temperature has inapparent positive correlation with soil CH4 fluxes of Rhizophora stylosa and Brugiera gym-monhiza.However,air temperature has negative correlation with soil CH4 fluxes of Kandelia candel,and remarkable negative corre-lation with Aegiceras corniculatum.Air temperature has not evidently negetive correlation with soil CO2 fluxes of Rhizophora sty-losa,Brugiera gymmonhiza,Kandelia candel,Aegiceras corniculatum.